code: def aggregation(self):
      return {
          "acc": mean,
      }
  
file_path: lm-evaluation-harness/lm_eval/tasks/webqs.py
imports: from lm_eval.base import rf, Task
  from lm_eval.metrics import mean
label_desc: Use image node_id 13 for calling the WebQs obj's underlying member method code with example usage: obj.aggregation() and returns: dict